Screw-propulsion of vessels



(No Model.)

B. J. PAHTZ.

SCREW. PROPULSION 0P VESSBLS; No. 471,274. Patented Mar. 22, 1892.

Fifi-1-.

rates SCREW-PROPULSION OF VESSELS.

SPECIFICATION forming part of Letters Patent No. 471,274, dated March22, 1892.

Application filed June 27, 1891. Serial No. 397,720. (No model.)

To aZZ whom it may concern.-

Be it known that I, ERNST J. PAHTZ, acitizen of the United States ofAmerica, and a resident of the city of Boston, in the county of Suffolkand State of Massachusetts, have invented certain new and usefulImprovements in Screw-Propulsion of Vessels, &c., of which the followingis a ful1,clear, and exact description.

This invention in the propulsion of vessels consists, in substance, ofthe combination,with

a fixed horizontal and longitudinal passage.

open at its opposite end portions for water to flow therethrough andlocated on the hull below the water-line of the vessel, and apropeller-screw placed and adapted by its shaft and connections thereof,as well known, or otherwise suitable to rotate in said water-way, so asto force water through it and out at its rear and discharge end, of anozzle at said dischargingend and in continuation of said water-way, andmeans connected to said propeller-shaft and adapted to move said nozzleindependently of and relative to the axis of rotation of said screw, allsubstantially as hereinafter described.

In the drawings forming part of this specification, Figure 1 is a sideelevation of the stern of avessel, and showing, in central 1ongitudinalsection, one form, and Figs. 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11 areviews of other forms, of construction and arrangement of this invention,all as hereinafter fully appears.

In the drawings, A represents the stern of a hull B of a vessel, havinga keel O and rudder D, all as well known and needing no more particularmention.

E is a fixed horizontal and longitudinal water-way located below thewater-line of the vessel just forward of the rudder D and at itsopposite end portions open for the passage of water therethrough.

F is a propeller-screw supported by its shaft F within and axiallycoincident with the water-way E, and all so as to be freely rotated bysuitable mechanism (not shown) for driving said shaft, as well known orotherwise suitably. By the rotation of the screw F the water is forcedthrough and driven out of the rear and discharging end E of saidwater-way, thereby propelling the vessel forward, the propulsion of thevessel backward being secured by reversing the turn of the screw, inwhich the forward end of said water-way becomes its discharge.

To increase the power exerted by the rotation of the screw in propellingthe vessel forward, the rear and discharging end E? of the water-wayEhas a nozzle G. (Shown of various forms and arrangements in thedrawings.) This nozzle G in all cases is in continuation of thewater-way E at its rear or discharging end, and it is arranged to bemoved thereon, thereby working in and on the water surrounding it andimparting motion to the water forced through and out of it by the actionof the screw, and, as has been described, the power and force ofpropulsion of the vessel through the water are increased to a mostefficient and marked extent.

In Fig. 1 the nozzle G is a round tube inclined axially to the axis ofthe screw and wator-passage surrounding it, and itisheld on thescrew-shaft F and thereby rotated around said axis, passing through thewater in an annular path, the inner and outer diameters of whichcorrespond to the diametrically-opposite points of the tube. In Figs. 2and 3 the axial lines of the rotating nozzle and the screw arecoincident and the nozzle at its discharging end is flattened. In Figs.4. and 5 the nozzle is tubular, and it is adapted by a cam a, secured tothe nozzle and at a bearing on the face of a crank-arm h of thescrew-shaft F to be horizontally moved laterally across the dischargingend of the water-way. Figs. 6, 7, 8, 9, and 10 severally represent inall three distinct forms for the discharging end of a nozzle G and allobvious from the drawings and' in which each form is shown in end andside views.

Using the combination of a screw-propeller in action within a water-wayof the vessel and a moving nozzle in continuation of said water-waythrough which water is discharged by the screw, all as has beenexplained, with air under pressure forced either into and through thenozzle or into the water just in front of the discharging end of thenozzle, the

water discharged by the nozzle is spread about:

and so made to act on a greater surface of the water through which thevessel is moving and against which said Water is discharged, and

so are obtained increased resistance from the IOO and said shaft, andadapted by the rotation of said shaft to move said nozzle relatively tosaid water-Way, substantially as described, I 5 for the purposesspecified.

In testimony whereof I have hereunto set my hand in the presence of tWosubscribing witnesses.

ERNST J. PAI'ITZ.

'Witnesses:

ALBERT W. BROWN, MARION E. BROWN.

